#define _CRT_SECURE_NO_WARNINGS 1
#include"Stack.h"
//初始化栈
void STInit(ST* ps)
{
	assert(ps);
	ps->a = NULL;
	ps->capacity = 0;
	ps->top = 0;
}
//销毁栈
void STDestroy(ST* ps)
{
	assert(ps);
	free(ps->a);
	ps->a = NULL;
	ps->capacity = 0;
	ps->top = 0;
}
//入栈函数
void STPush(ST* ps, int x)
{
	assert(ps);
	if (ps->capacity == ps->top)
	{
		int newcapacity = ps->capacity == 0 ? 4 : ps->capacity * 2;
		STDataType* tmp = (STDataType*)realloc(ps->a, sizeof(STDataType) * newcapacity);
		if (tmp == NULL)
		{
			perror("realloc fales");
			exit(-1);
		}
		ps->a = tmp;
		ps->capacity = newcapacity;
	}
	ps->a[ps->top] = x;
	ps->top++;
}
//出栈函数
void STPop(ST* ps)
{
	assert(ps);
	assert(ps->top > 0);

	ps->top--;
}
//返回栈顶元素
STDataType  STTop(ST* ps)
{
	assert(ps);
	assert(ps->top > 0);

	return ps->a[ps->top - 1];

}
//获取栈中元素个数
int  STSize(ST* ps)
{
	assert(ps);

	return ps->top;

}
//检测栈是否为空
bool STEmpty(ST* ps)
{
	assert(ps);

	return ps->top == 0;

}

